This is an optional Lunsford Titanium Hinge Pin Kit, and is intended for use with the Associated B4 and T4 vehicles. Lunsford hinge pins are machined from precision ground 6AL/4V titanium
stock and polished to a fine finish. Racers stand to gain the most
performance from weight reduction, and these hinge pins are another
option to add a racing edge to your favorite car or truck.